A group of retired crash investigators featured in the new documentary "TWA Flight 800" claim the cause of a 1996 plane crash near Long Island, N.Y., was covered up.

TWA Flight 800 exploded over Long Island shortly after taking off from John F. Kennedy International Airport, killing 230 people.

A four-year long investigation concluded that the cause of the blast was an exploding fuel tank.

But now six retired investigators from TWA, the National Transportation Safety Board, and the Air Line Pilots Association say the final report was falsified.

"The general consensus is -- it was either a terrorist attack they wanted to ignore or an accident as a result of a military operation that went wrong and they did not want to acknowledge responsibility for it," retired investigator Hank Hughes said.

The investigators say they have radar and forensic evidence to prove the explosion came from outside the airplane. They're calling for federal investigators to re-open the case.

But some former government officials say there's no question the explosion was an accident.